397 lines
15 KiB
C
397 lines
15 KiB
C
/*
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* Copyright (C)2011-2012, 2014-2015, 2017, 2019 D. R. Commander.
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the libjpeg-turbo Project nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This program demonstrates how to compress, decompress, and transform JPEG
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* images using the TurboJPEG C API
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <turbojpeg.h>
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#ifdef _WIN32
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#define strcasecmp stricmp
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#define strncasecmp strnicmp
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#endif
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#define THROW(action, message) { \
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printf("ERROR in line %d while %s:\n%s\n", __LINE__, action, message); \
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retval = -1; goto bailout; \
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}
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#define THROW_TJ(action) THROW(action, tjGetErrorStr2(tjInstance))
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#define THROW_UNIX(action) THROW(action, strerror(errno))
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#define DEFAULT_SUBSAMP TJSAMP_444
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#define DEFAULT_QUALITY 95
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const char *subsampName[TJ_NUMSAMP] = {
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"4:4:4", "4:2:2", "4:2:0", "Grayscale", "4:4:0", "4:1:1"
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};
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const char *colorspaceName[TJ_NUMCS] = {
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"RGB", "YCbCr", "GRAY", "CMYK", "YCCK"
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};
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tjscalingfactor *scalingFactors = NULL;
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int numScalingFactors = 0;
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/* DCT filter example. This produces a negative of the image. */
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static int customFilter(short *coeffs, tjregion arrayRegion,
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tjregion planeRegion, int componentIndex,
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int transformIndex, tjtransform *transform)
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{
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int i;
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for (i = 0; i < arrayRegion.w * arrayRegion.h; i++)
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coeffs[i] = -coeffs[i];
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return 0;
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}
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static void usage(char *programName)
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{
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int i;
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printf("\nUSAGE: %s <Input image> <Output image> [options]\n\n",
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programName);
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printf("Input and output images can be in Windows BMP or PBMPLUS (PPM/PGM) format. If\n");
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printf("either filename ends in a .jpg extension, then the TurboJPEG API will be used\n");
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printf("to compress or decompress the image.\n\n");
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printf("Compression Options (used if the output image is a JPEG image)\n");
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printf("--------------------------------------------------------------\n\n");
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printf("-subsamp <444|422|420|gray> = Apply this level of chrominance subsampling when\n");
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printf(" compressing the output image. The default is to use the same level of\n");
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printf(" subsampling as in the input image, if the input image is also a JPEG\n");
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printf(" image, or to use grayscale if the input image is a grayscale non-JPEG\n");
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printf(" image, or to use %s subsampling otherwise.\n\n",
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subsampName[DEFAULT_SUBSAMP]);
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printf("-q <1-100> = Compress the output image with this JPEG quality level\n");
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printf(" (default = %d).\n\n", DEFAULT_QUALITY);
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printf("Decompression Options (used if the input image is a JPEG image)\n");
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printf("---------------------------------------------------------------\n\n");
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printf("-scale M/N = Scale the input image by a factor of M/N when decompressing it.\n");
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printf("(M/N = ");
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for (i = 0; i < numScalingFactors; i++) {
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printf("%d/%d", scalingFactors[i].num, scalingFactors[i].denom);
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if (numScalingFactors == 2 && i != numScalingFactors - 1)
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printf(" or ");
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else if (numScalingFactors > 2) {
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if (i != numScalingFactors - 1)
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printf(", ");
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if (i == numScalingFactors - 2)
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printf("or ");
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}
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}
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printf(")\n\n");
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printf("-hflip, -vflip, -transpose, -transverse, -rot90, -rot180, -rot270 =\n");
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printf(" Perform one of these lossless transform operations on the input image\n");
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printf(" prior to decompressing it (these options are mutually exclusive.)\n\n");
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printf("-grayscale = Perform lossless grayscale conversion on the input image prior\n");
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printf(" to decompressing it (can be combined with the other transform operations\n");
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printf(" above.)\n\n");
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printf("-crop WxH+X+Y = Perform lossless cropping on the input image prior to\n");
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printf(" decompressing it. X and Y specify the upper left corner of the cropping\n");
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printf(" region, and W and H specify the width and height of the cropping region.\n");
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printf(" X and Y must be evenly divible by the MCU block size (8x8 if the input\n");
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printf(" image was compressed using no subsampling or grayscale, 16x8 if it was\n");
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printf(" compressed using 4:2:2 subsampling, or 16x16 if it was compressed using\n");
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printf(" 4:2:0 subsampling.)\n\n");
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printf("General Options\n");
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printf("---------------\n\n");
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printf("-fastupsample = Use the fastest chrominance upsampling algorithm available in\n");
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printf(" the underlying codec.\n\n");
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printf("-fastdct = Use the fastest DCT/IDCT algorithms available in the underlying\n");
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printf(" codec.\n\n");
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printf("-accuratedct = Use the most accurate DCT/IDCT algorithms available in the\n");
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printf(" underlying codec.\n\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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tjscalingfactor scalingFactor = { 1, 1 };
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int outSubsamp = -1, outQual = -1;
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tjtransform xform;
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int flags = 0;
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int width, height;
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char *inFormat, *outFormat;
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FILE *jpegFile = NULL;
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unsigned char *imgBuf = NULL, *jpegBuf = NULL;
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int retval = 0, i, pixelFormat = TJPF_UNKNOWN;
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tjhandle tjInstance = NULL;
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if ((scalingFactors = tjGetScalingFactors(&numScalingFactors)) == NULL)
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THROW_TJ("getting scaling factors");
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memset(&xform, 0, sizeof(tjtransform));
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if (argc < 3)
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usage(argv[0]);
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/* Parse arguments. */
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for (i = 3; i < argc; i++) {
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if (!strncasecmp(argv[i], "-sc", 3) && i < argc - 1) {
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int match = 0, temp1 = 0, temp2 = 0, j;
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if (sscanf(argv[++i], "%d/%d", &temp1, &temp2) < 2)
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usage(argv[0]);
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for (j = 0; j < numScalingFactors; j++) {
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if ((double)temp1 / (double)temp2 == (double)scalingFactors[j].num /
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(double)scalingFactors[j].denom) {
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scalingFactor = scalingFactors[j];
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match = 1;
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break;
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}
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}
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if (match != 1)
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usage(argv[0]);
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} else if (!strncasecmp(argv[i], "-su", 3) && i < argc - 1) {
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i++;
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if (!strncasecmp(argv[i], "g", 1))
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outSubsamp = TJSAMP_GRAY;
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else if (!strcasecmp(argv[i], "444"))
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outSubsamp = TJSAMP_444;
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else if (!strcasecmp(argv[i], "422"))
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outSubsamp = TJSAMP_422;
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else if (!strcasecmp(argv[i], "420"))
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outSubsamp = TJSAMP_420;
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else
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usage(argv[0]);
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} else if (!strncasecmp(argv[i], "-q", 2) && i < argc - 1) {
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outQual = atoi(argv[++i]);
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if (outQual < 1 || outQual > 100)
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usage(argv[0]);
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} else if (!strncasecmp(argv[i], "-g", 2))
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xform.options |= TJXOPT_GRAY;
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else if (!strcasecmp(argv[i], "-hflip"))
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xform.op = TJXOP_HFLIP;
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else if (!strcasecmp(argv[i], "-vflip"))
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xform.op = TJXOP_VFLIP;
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else if (!strcasecmp(argv[i], "-transpose"))
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xform.op = TJXOP_TRANSPOSE;
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else if (!strcasecmp(argv[i], "-transverse"))
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xform.op = TJXOP_TRANSVERSE;
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else if (!strcasecmp(argv[i], "-rot90"))
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xform.op = TJXOP_ROT90;
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else if (!strcasecmp(argv[i], "-rot180"))
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xform.op = TJXOP_ROT180;
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else if (!strcasecmp(argv[i], "-rot270"))
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xform.op = TJXOP_ROT270;
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else if (!strcasecmp(argv[i], "-custom"))
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xform.customFilter = customFilter;
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else if (!strncasecmp(argv[i], "-c", 2) && i < argc - 1) {
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if (sscanf(argv[++i], "%dx%d+%d+%d", &xform.r.w, &xform.r.h, &xform.r.x,
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&xform.r.y) < 4 ||
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xform.r.x < 0 || xform.r.y < 0 || xform.r.w < 1 || xform.r.h < 1)
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usage(argv[0]);
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xform.options |= TJXOPT_CROP;
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} else if (!strcasecmp(argv[i], "-fastupsample")) {
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printf("Using fast upsampling code\n");
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flags |= TJFLAG_FASTUPSAMPLE;
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} else if (!strcasecmp(argv[i], "-fastdct")) {
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printf("Using fastest DCT/IDCT algorithm\n");
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flags |= TJFLAG_FASTDCT;
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} else if (!strcasecmp(argv[i], "-accuratedct")) {
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printf("Using most accurate DCT/IDCT algorithm\n");
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flags |= TJFLAG_ACCURATEDCT;
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} else usage(argv[0]);
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}
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/* Determine input and output image formats based on file extensions. */
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inFormat = strrchr(argv[1], '.');
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outFormat = strrchr(argv[2], '.');
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if (inFormat == NULL || outFormat == NULL || strlen(inFormat) < 2 ||
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strlen(outFormat) < 2)
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usage(argv[0]);
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inFormat = &inFormat[1];
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outFormat = &outFormat[1];
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if (!strcasecmp(inFormat, "jpg")) {
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/* Input image is a JPEG image. Decompress and/or transform it. */
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long size;
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int inSubsamp, inColorspace;
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int doTransform = (xform.op != TJXOP_NONE || xform.options != 0 ||
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xform.customFilter != NULL);
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unsigned long jpegSize;
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/* Read the JPEG file into memory. */
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if ((jpegFile = fopen(argv[1], "rb")) == NULL)
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THROW_UNIX("opening input file");
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if (fseek(jpegFile, 0, SEEK_END) < 0 || ((size = ftell(jpegFile)) < 0) ||
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fseek(jpegFile, 0, SEEK_SET) < 0)
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THROW_UNIX("determining input file size");
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if (size == 0)
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THROW("determining input file size", "Input file contains no data");
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jpegSize = (unsigned long)size;
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if ((jpegBuf = (unsigned char *)tjAlloc(jpegSize)) == NULL)
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THROW_UNIX("allocating JPEG buffer");
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if (fread(jpegBuf, jpegSize, 1, jpegFile) < 1)
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THROW_UNIX("reading input file");
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fclose(jpegFile); jpegFile = NULL;
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if (doTransform) {
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/* Transform it. */
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unsigned char *dstBuf = NULL; /* Dynamically allocate the JPEG buffer */
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unsigned long dstSize = 0;
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if ((tjInstance = tjInitTransform()) == NULL)
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THROW_TJ("initializing transformer");
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xform.options |= TJXOPT_TRIM;
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if (tjTransform(tjInstance, jpegBuf, jpegSize, 1, &dstBuf, &dstSize,
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&xform, flags) < 0)
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THROW_TJ("transforming input image");
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tjFree(jpegBuf);
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jpegBuf = dstBuf;
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jpegSize = dstSize;
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} else {
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if ((tjInstance = tjInitDecompress()) == NULL)
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THROW_TJ("initializing decompressor");
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}
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if (tjDecompressHeader3(tjInstance, jpegBuf, jpegSize, &width, &height,
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&inSubsamp, &inColorspace) < 0)
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THROW_TJ("reading JPEG header");
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printf("%s Image: %d x %d pixels, %s subsampling, %s colorspace\n",
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(doTransform ? "Transformed" : "Input"), width, height,
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subsampName[inSubsamp], colorspaceName[inColorspace]);
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if (!strcasecmp(outFormat, "jpg") && doTransform &&
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scalingFactor.num == 1 && scalingFactor.denom == 1 && outSubsamp < 0 &&
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outQual < 0) {
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/* Input image has been transformed, and no re-compression options
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have been selected. Write the transformed image to disk and exit. */
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if ((jpegFile = fopen(argv[2], "wb")) == NULL)
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THROW_UNIX("opening output file");
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if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1)
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THROW_UNIX("writing output file");
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fclose(jpegFile); jpegFile = NULL;
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goto bailout;
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}
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/* Scaling and/or a non-JPEG output image format and/or compression options
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have been selected, so we need to decompress the input/transformed
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image. */
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width = TJSCALED(width, scalingFactor);
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height = TJSCALED(height, scalingFactor);
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if (outSubsamp < 0)
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outSubsamp = inSubsamp;
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pixelFormat = TJPF_BGRX;
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if ((imgBuf = (unsigned char *)tjAlloc(width * height *
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tjPixelSize[pixelFormat])) == NULL)
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THROW_UNIX("allocating uncompressed image buffer");
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if (tjDecompress2(tjInstance, jpegBuf, jpegSize, imgBuf, width, 0, height,
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pixelFormat, flags) < 0)
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THROW_TJ("decompressing JPEG image");
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tjFree(jpegBuf); jpegBuf = NULL;
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tjDestroy(tjInstance); tjInstance = NULL;
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} else {
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/* Input image is not a JPEG image. Load it into memory. */
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if ((imgBuf = tjLoadImage(argv[1], &width, 1, &height, &pixelFormat,
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0)) == NULL)
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THROW_TJ("loading input image");
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if (outSubsamp < 0) {
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if (pixelFormat == TJPF_GRAY)
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outSubsamp = TJSAMP_GRAY;
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else
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outSubsamp = TJSAMP_444;
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}
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printf("Input Image: %d x %d pixels\n", width, height);
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}
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printf("Output Image (%s): %d x %d pixels", outFormat, width, height);
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if (!strcasecmp(outFormat, "jpg")) {
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/* Output image format is JPEG. Compress the uncompressed image. */
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unsigned long jpegSize = 0;
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jpegBuf = NULL; /* Dynamically allocate the JPEG buffer */
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if (outQual < 0)
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outQual = DEFAULT_QUALITY;
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printf(", %s subsampling, quality = %d\n", subsampName[outSubsamp],
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outQual);
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if ((tjInstance = tjInitCompress()) == NULL)
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THROW_TJ("initializing compressor");
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if (tjCompress2(tjInstance, imgBuf, width, 0, height, pixelFormat,
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&jpegBuf, &jpegSize, outSubsamp, outQual, flags) < 0)
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THROW_TJ("compressing image");
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tjDestroy(tjInstance); tjInstance = NULL;
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/* Write the JPEG image to disk. */
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if ((jpegFile = fopen(argv[2], "wb")) == NULL)
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THROW_UNIX("opening output file");
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if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1)
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THROW_UNIX("writing output file");
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tjDestroy(tjInstance); tjInstance = NULL;
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fclose(jpegFile); jpegFile = NULL;
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tjFree(jpegBuf); jpegBuf = NULL;
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} else {
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/* Output image format is not JPEG. Save the uncompressed image
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directly to disk. */
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printf("\n");
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if (tjSaveImage(argv[2], imgBuf, width, 0, height, pixelFormat, 0) < 0)
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THROW_TJ("saving output image");
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}
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bailout:
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tjFree(imgBuf);
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if (tjInstance) tjDestroy(tjInstance);
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tjFree(jpegBuf);
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if (jpegFile) fclose(jpegFile);
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return retval;
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}
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